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JEE Mains · Physics · STD 12 - 10. Wave optics

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In Young's double slit experiment, the fringes produced by red light are closer as compared to those produced by blue light.
Reason (R): The fringe width is directly proportional to the wavelength of light.
In the light of the above statements, choose the correct answer from the options given below.

  1. A Both \((\mathbf{A})\) and \((\mathbf{R})\) are true but \((\mathbf{R})\) is NOT the correct explanation of \((\mathbf{A})\)
  2. B (A) is true but (R) is false
  3. C Both (A) and (R) are true and (R) is the correct explanation of (A)
  4. D (A) is false but (R) is true
Verified Solution

Answer & Solution

Correct Answer

(D) (A) is false but (R) is true

Step-by-step Solution

Detailed explanation

\(\begin{aligned} & \beta=\frac{\lambda D}{d} \\ & \lambda_{\text {red }} < \lambda_{\text {blue }} \end{aligned}\) Assertion is false. Reason is true.
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